At
this point, I sent player two ahead to trigger another checkpoint...
but the most horrible thing happened... he triggered the Captain cutscene
instead. That means no more outside of the map for player 1.

The
cafeteria area, and space directly outside of the bridge are still
unexplored... but passing through the loading zone confirmed my speculation.

Note:
Be very careful with the loading zone. It is tricky because player 1 is
in a location where player 2 cannot teleport. This results in highly
unusual things... like player 1 being captured in an infinite death
animation in the light fixtures...